Bendable display apparatus

ABSTRACT

A bendable display apparatus includes a carrying plate, a bendable display, and two supporting devices. Each supporting device includes a dual-shaft hinge module and two buffering modules respectively arranged at two opposite sides of the dual-shaft hinge module. Each dual-shaft hinge module includes two shafts, a linking member clamped between the two shafts, and two side wing members respectively and slidably installed on the two shafts. The two buffering modules are respectively installed on the two shafts and are respectively cooperated with the two side wing members. Each buffering module includes an internal connecting member fixed on and synchronously rotatable with the corresponding shaft and an external connecting member slidably disposed on the internal connecting member and provided to be fixed on a carrying plate. Each side wing member has a limiting portion passing through the corresponding internal connecting member and the corresponding external connecting member.

CROSS REFERENCE TO RELATED APPLICATION

The present application is a divisional application of co-pendingapplication Ser. No. 15/847,565, filed on Dec. 19, 2017 and entitled“BENDABLE DISPLAY APPARATUS, SUPPORTING DEVICE, AND DUAL-SHAFT HINGEMODULE”, now allowed. Moreover, this divisional application rejoinsclaims based on Invention I, according to the Restriction Requirementdated Jun. 3, 2019.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present disclosure relates to a display device; in particular, to abendable display apparatus.

2. Description of Related Art

When a conventional supporting device is outwardly bent, the totallength of the hinge module of the conventional supporting device is notchanged, and a plate mounted on an outer surface of the conventionalsupporting device is deformed because the hinge module stretches theplate. That is to say, when a bendable display mounted on the outersurface of the conventional supporting device is outwardly bent, thebendable display is easily broken because the hinge module of theconventional supporting device stretches the bendable display.

SUMMARY OF THE INVENTION

The present disclosure provides a bendable display apparatus, asupporting device, and a dual-shaft hinge module to effectively improvethe drawbacks associated with conventional supporting devices (orconventional hinge modules).

The present disclosure discloses a bendable display apparatus, whichincludes a carrying plate, a bendable display, and two supportingdevices. The carrying plate has an inner surface and an outer surfaceopposing to the inner surface. The bendable display is mounted on theouter surface of the carrying surface. The two supporting devices aredisposed on the inner surface of the carrying plate and define tworotation axes. Each of the two supporting devices includes a dual-shafthinge module and two buffering modules. The dual-shaft hinge moduleincludes two shafts, a transmitting member, and two side wing members.The two shafts are respectively arranged in the two rotation axes andeach have a spiral groove recessed on an outer surface thereof. Thetransmitting member is clamped between the two shafts. The transmittingmember has two driving portions respectively protruding from twoopposite sides thereof and is respectively inserted into the two spiralgrooves of the two shafts. The two side wing members are respectivelyand slidably fastened to the two shafts and each have a limitingportion. One of the two shafts is spinable to synchronously rotate theother shaft through the transmitting member so as to respectively movethe two side wing members along the two shafts. The two bufferingmodules are respectively fastened to the two shafts and are arranged attwo opposite outer sides of the two shafts. The two buffering modulesare respectively cooperated with the two side wing members. Each of thetwo buffering modules includes an internal connecting member and anexternal connecting member. The internal connecting member is fixed onand synchronously rotatable with the corresponding shaft. The internalconnecting member has a long hole parallel to each of the two rotationaxes and sleeved on the limiting portion of the corresponding side wingmember. The external connecting member is fixed on the inner surface ofthe carrying plate and is slidably disposed on the internal connectingmember. The external connecting member has a slanting hole non-parallelto each of the two rotation axes and sleeved on the limiting portion ofthe corresponding side wing member. The slanting hole has a first endarranged adjacent to the corresponding shaft and an opposite second endarranged away from the corresponding shaft. When the carrying plate isbent along at least one of the two axes between an unfolded position andan outwardly folded position, the external connecting member of each ofthe buffering modules slides with respect to the corresponding internalconnecting member, and each of the limiting portions moves in thecorresponding slanting hole from the first end to the second end.

The present disclosure also discloses a supporting device for beingmounted on a carrying plate. The supporting device includes a dual-shafthinge module and two buffering modules. The dual-shaft hinge moduleincludes two shafts, a transmitting member, and two side wing members.The two shafts are substantially parallel to each other and each have aspiral groove recessed on an outer surface thereof. The transmittingmember is clamped between the two shafts. The transmitting member hastwo driving portions respectively protruding from two opposite sidesthereof and respectively inserted into the two spiral grooves of the twoshafts. The two side wing members are respectively and slidably fastenedto the two shafts and each have a limiting portion. One of the twoshafts is spinable to synchronously rotate the other shaft through thetransmitting member so as to respectively move the two side wing membersalong the two shafts. The two buffering modules are respectivelyfastened to the two shafts and are arranged at two opposite outer sidesof the two shafts. The two buffering modules are respectively cooperatedwith the two side wing members. Each of the two buffering modulesincludes an internal connecting member and an external connectingmember. The internal connecting member is fixed on and synchronouslyrotatable with the corresponding shaft. The internal connecting memberhas a long hole parallel to each of the two shafts and sleeved on thelimiting portion of the corresponding side wing member. The externalconnecting member is slidably disposed on the internal connecting memberand is configured for being fixed on an inner surface of the carryingplate. The external connecting member has a slanting hole non-parallelto the long hole and sleeved on the limiting portion of thecorresponding side wing member. The slanting hole has a first endarranged adjacent to the corresponding shaft and an opposite second endarranged away from the corresponding shaft.

The present disclosure further discloses a dual-shaft hinge module,which includes two shafts, a transmitting member, two linking members,and two side wing members. The two shafts are substantially parallel toeach other and each have a spiral groove recessed on an outer surfacethereof. The transmitting member is clamped between the two shafts. Thetransmitting member has two driving portions respectively protrudingfrom two opposite sides thereof and respectively inserted into the twospiral grooves. The two linking members are respectively arranged at twoopposite sides of the transmitting block. Each of the two linkingmembers is sleeved on the two shafts, and two opposite ends of thetransmitting rod are respectively abutted against inner surfaces of thetwo linking members. The two side wing members are respectively andslidably fastened to the two shafts. Each of the two side wing membersincludes two end portions slidably sleeved on the corresponding shaftand respectively abutted against outer surfaces of the two linkingmembers, and each of the two side wing members has a limiting portion.When one of the two shafts is spun to synchronously rotate the othershaft through the transmitting member, the transmitting member and thetwo linking members are synchronously moved to move the two side wingmembers along the two shafts at the same time.

In summary, when the two shafts of each supporting device are spun(i.e., the carrying plate is bent), the hinge module and the connectedtwo buffering modules of each supporting device are cooperated torelatively move each external connecting member and the correspondinginternal connecting member in a predetermined distance, therebypreventing the bendable display from suffering damage.

In order to further appreciate the characteristics and technicalcontents of the present disclosure, references are hereunder made to thedetailed descriptions and appended drawings in connection with thepresent disclosure. However, the appended drawings are merely shown forexemplary purposes, and should not be construed as restricting the scopeof the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a bendable display apparatus at anunfolded position according to an embodiment of the present disclosure;

FIG. 2 is a perspective view showing the bendable display apparatus atan outwardly folded position according to the embodiment of the presentdisclosure;

FIG. 3 is a cross-sectional view taken along a cross-sectional line ofFIG. 2;

FIG. 4 is a cross-sectional view taken along a cross-sectional lineIV-IV of FIG. 2;

FIG. 5 is a cross-sectional perspective view of a portion of FIG. 2;

FIG. 6 is an exploded view of FIG. 1;

FIG. 7 is an exploded view of FIG. 1 from another perspective;

FIG. 8 is an exploded view showing a supporting device according to theembodiment of the present disclosure;

FIG. 9 is a cross-sectional view taken along a cross-sectional lineIX-IX of FIG. 8;

FIG. 10 is a perspective view showing a dual-shaft hinge module of FIG.8 in which two positioning members are omitted;

FIG. 11 is an exploded view of FIG. 10;

FIG. 12 is an exploded view of FIG. 10 from another perspective;

FIG. 13 is a perspective view showing a buffering module of FIG. 8;

FIG. 14 is an exploded view of FIG. 13; and

FIG. 15 is an exploded view of FIG. 13 from another perspective.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Reference is made to FIGS. 1 to 15, which illustrate an embodiment ofthe present disclosure. References are hereunder made to the detaileddescriptions and appended drawings in connection with the presentdisclosure. However, the appended drawings are merely provided forexemplary purposes, and should not be construed as restricting the scopeof the present disclosure.

Reference is first made to FIGS. 1 to 7, which illustrate a bendabledisplay apparatus 1000 of the present embodiment. The bendable displayapparatus 1000 includes a carrying plate 200, two supporting devices 100mounted on an inner surface 201 of the carrying plate 200, and abendable display 300 mounted on an outer surface 202 of the carryingplate 200. The two supporting devices 100 co-define two parallelrotation axes L. The carrying plate 200 in the present embodimentincludes a rubber sheet and at least one metallic sheet embedded in therubber sheet, but the present disclosure is not limited thereto.Moreover, in the present embodiment, a portion (i.e., a center portion)of the bendable display 300 corresponding in position to the twosupporting devices 100 can be outwardly bent at 180 degrees (as shown inFIG. 2) without suffering damage, but the present disclosure is notlimited thereto.

It should be noted that the movement of the bendable display apparatus1000 is a relative motion, but the figures are of a fixed part of thecomponents for clearly showing the present embodiment. Moreover, each ofthe two supporting devices 100 in the present embodiment is applied tothe bendable display apparatus 1000, but the supporting device 100 canbe applied to other apparatus.

The bendable display apparatus 1000 can be bent between an unfoldedposition (as shown in FIG. 1) and an outwardly folded position (as shownin FIG. 2). The following description discloses the structure of each ofthe components of the bendable display apparatus 1000, and thendiscloses the related features of the components of the bendable displayapparatus 1000. The two supporting devices 100 in the present embodimentare substantially an identical or a symmetrical structure, so thefollowing description only illustrates one of the two supporting devices100.

As shown in FIGS. 8 and 9, the supporting device 100 includes adual-shaft hinge module 1 and two buffering modules 2 respectivelyarranged at two opposite sides of the dual-shaft hinge module 1. Thedual-shaft hinge module 1 in the present embodiment is applied to thesupporting device 100, but the dual-shaft hinge module 1 can be appliedto other devices.

The dual-shaft hinge module 1 includes two shafts 11, a plurality oftorsion washers 12, a transmitting member 13, two linking members 14,two side wing members 15, and two positioning members 16. The two shafts11 are respectively arranged in the two rotation axes L. Each of thetorsion washers 12 is sleeved on the two shafts 11. A portion of thetransmitting member 13 is sandwiched between the two shafts 11. Each ofthe two linking members 14 is sleeved on the two shafts 11, and the twolinking members 14 are arranged at two opposite sides of thetransmitting member 13. The two side wing members 15 are respectivelyand slidably disposed on the two shafts 11. The following descriptiondiscloses the structure and connection of each component of thedual-shaft hinge module 1.

As shown in FIGS. 10 to 12, the two shafts 11 are substantially parallelto each other, that is to say, central lines of the two shafts 11 arerespectively overlapped on the two rotation axes L. The two shafts 11 inthe present embodiment are in a mirror symmetrical arrangement, so thefollowing description only discloses the structure of one of the twoshafts 11 for the sake of brevity.

The shaft 11 includes a driving segment 111, two extending segments 112respectively arranged at two opposite outer sides of the driving segment111 (i.e., the left side and the right side of the driving segment 111as shown in FIG. 11), and two wedging segments 113 respectively arrangedat two opposite outer sides of the two extending segments 112 (i.e., theleft side and the right side of the two extending segments 112 as shownin FIG. 11). A cross section of the driving segment 111 perpendicular tothe central line of the shaft 11 has a substantial circular shape, and amaximum diameter of the driving segment 111 is equal to that of theshaft 11. A cross section of each of the two extending segments 112perpendicular to the central line of the shaft 11 has a non-circularshape. A cross section of each of the two wedging segments 113perpendicular to the central line of the shaft 11 can be a circularshape or a non-circular shape according to a designer's demand.

Specifically, the shaft 11 has two spiral grooves 1111 recessed on anouter surface of the driving segment 111, and each of the spiral grooves1111 has a spiral angle within a range of 40-60 degrees. The spiralangle in the present embodiment is 45 degrees, but the presentdisclosure is not limited thereto. A depth of each of the spiral grooves1111 is ⅕- 1/7 of the maximum diameter of the driving segment 111, andthe depth of each of the spiral grooves 1111 in the present embodimentis substantially ⅙ of the maximum diameter of the driving segment 111.Moreover, a projecting region, which is defined by orthogonallyprojecting each of the spiral grooves 1111 in a longitudinal directionof the shaft 11 (i.e., the rotation axis L) onto a plane, is an arcshape having a central angle equal to or smaller than 90 degrees, andthe central angle in the present embodiment is 90 degrees, but thepresent disclosure is not limited thereto.

Each of the extending segments 112 in the present embodiment issubstantially a round column, and the outer diameter is smaller than themaximum diameter of the driving segment 111. Moreover, each of thewedging segments 113 is a column having the non-circular cross section,so that the two wedging segments 113 can be respectively fixed to thetwo buffering modules 2.

For the two shafts 11, the two extending segments 112 of each of the twoshafts 11 respectively couple through the torsion washers 12. That is tosay, the torsion washers 12 of the dual-shaft hinge module 1 arerespectively arranged at two opposite sides of the two driving segments111 (i.e., the left side and the right side of the two driving segments111 as shown in FIG. 10). Thus, the two shafts 11 are spinable withrespect to each of the torsion washers 12 to provide torsion for thedual-shaft hinge module 1 by a friction generated between the extendingsegments 112 of the two shafts 11 and each of the torsion washers 12.Moreover, the arrangement of the torsion washers 12 can be provided toeffectively maintain the relative position between the two shafts 11.

Moreover, in the two shafts 11 as shown in FIG. 8, any two adjacentwedging segments 113 are inserted into one of the positioning members16. That is to say, the two wedging segments 113 of each of the twoshafts 11 are respectively inserted into and fixed in the twopositioning members 16. A center portion of each of the two positioningmembers 16 is fixed on the inner surface 201 of the carrying plate 200(as shown in FIG. 6).

As shown in FIGS. 10 to 12, the transmitting member 13 includes atransmitting block 131 and a transmitting rod 132 connected to (i.e.,coupling through and fastened to) the transmitting block 131. Thetransmitting block 131 and the transmitting rod 132 can be integrallyconnected to each other or detachably connected to each other, but thepresent disclosure is not limited thereto.

The transmitting block 131 has two concave surfaces 1311 respectivelyrecessed on two opposite sides thereof (i.e., the front side and therear side of the transmitting block 131 as shown in FIG. 11) and fourdriving portions 1312 respectively protruding from the two concavesurfaces 1311. The four driving portions 1312 of the transmitting block131 in the present embodiment are in a mirror symmetrical arrangement,but the present disclosure is not limited thereto.

Specifically, the transmitting block 131 is sandwiched between the twoshafts 11, and the two concave surfaces 1311 of the transmitting block131 respectively face the driving segments 111 of the two shafts 11.Each of the two concave surfaces 1311 is arranged to accommodate aportion of the corresponding shaft 11. The two driving portions 1312,which are corresponding in position to the same concave surface 1311,are respectively inserted into the two spiral grooves 1111 of thecorresponding shaft 11.

Moreover, in order to firmly connect the two shafts 11 and thetransmitting block 131, the connection between the two shafts 11 and thetransmitting block 131 in the present embodiment can be provided withthe following features.

Specifically, in a cross section of the dual-shaft hinge module 1perpendicular to each of the two axes L (i.e., a cross section of thetwo shafts 11 and the blocking segment 131 as shown in FIG. 9), each ofthe driving segments 111 is substantially a circular shape, and each ofthe two concave surfaces 1311 is substantially an arc shape having acenter of circle overlapped at a center of the portion of the drivingsegment 111 of the corresponding shaft 11. Moreover, in the crosssection of the dual-shaft hinge module 1, a radius of each of the twoconcave surfaces 1311 is substantially equal to (i.e., slightly largerthan) that of each driving segment 111, and each of the two concavesurfaces 1311 has a central angle within a range of 80-110 degrees(i.e., 90 degrees), but the present disclosure is not limited thereto.

In addition, the number of the spiral grooves 1111 of each of the twoshafts 11 in the present embodiment is two, and each of the concavesurfaces 1311 is formed with two driving portions 1312, but the presentdisclosure is not limited thereto. For example, in other embodiments ofthe present disclosure, each of the two shafts 11 can be formed with asingle spiral groove 1111, and the transmitting block 131 has twodriving portions 1312 respectively arranged in the two concave surfaces1311 for respectively inserting into the spiral grooves 1111 of the twoshafts 11.

As shown in FIGS. 10 to 12, the longitudinal direction of thetransmitting rod 132 is substantially parallel to each of the tworotation axes L. The transmitting rod 132 in the present embodimentincludes a fixing segment 1321 and two connecting segments 1322respectively extending from two opposite ends of the fixing segment1321. The fixing segment 1321 is wedged in the transmitting block 131.The two connecting segments 1322 respectively pass through the torsionwashers 12, and each of the two connecting segments 1322 and thecorresponding torsion washers 12 are preferably in a frictionlessconnection or a low friction connection, so that the two connectingsegments 1322 can slide with respect to the torsion washers 12 moresmooth.

As shown in FIGS. 10 to 12, the two linking members 14 in the presentembodiment are respectively arranged at two opposite sides of thetransmitting block 131, and each of the linking members 14 is sleeved onthe two shafts 11. Two opposite ends of the transmitting rod 132 (asshown in FIG. 11) are respectively abutted against inner surfaces of thetwo linking members 14. Each of the two shafts 11 and the correspondinglinking members 14 are preferably in a frictionless connection or a lowfriction connection, so that each of the linking members 14 can slidewith respect to the two shafts 11 more smooth. It should be noted thateach of the linking members 14 in the present embodiment includes aplurality of stacked washers, but the present disclosure is not limitedthereto. For example, in other embodiments of the present disclosure,the linking member 14 can be a single structure.

As shown in FIGS. 10 to 12, the two side wing members 15 arerespectively and slidably fastened to the two shafts 11. In the presentembodiment, each of the two side wing members 15 includes a long rod151, a wing 152 perpendicularly connected to the long rod 151, alimiting portion 153 formed on an end of the wing 152, and two endportions 154 respectively installed on two opposite ends of the long rod151.

The long rod 151 of each of the two side wing members 15 is parallel toeach of the two rotation axes L, and the long rod 151 and the wing 152of each of the two side wing members 15 in the present embodiment areintegrally formed as a T-shaped structure. Each of the positioningportions 153 is integrally formed on the corresponding wing 152 andfaces the inner surface 201 of the carrying plate 200. The two endportions 154 of each of the side wing members 15 are slidably sleeved onthe corresponding shaft 11 and are respectively abutted against outersurfaces of the two linking members 14. Each of the two shafts 11 andthe corresponding end portions 154 are preferably in a frictionlessconnection or a low friction connection, so that each of the endportions 154 can slide with respect to the corresponding shaft 11 moresmooth.

Accordingly, the transmitting member 13 and the two linking members 14are synchronously movable to move the two side wing members 15 along thetwo shafts 11 at the same time. In addition, the transmitting member 13,the two linking members 14, and the two side wing members 15 arerotatable along at least one of the two rotation axes L with respect tothe two shafts 11 and the torsion washers 12.

In addition, the two linking members 14 and the transmitting member 13in the present embodiment are different components, but the presentdisclosure is not limited thereto. For example, in other embodiments ofthe present disclosure, the two linking members 14 can be regarded as apart of the transmitting member 13 and are respectively connected to thetwo connecting segments 1322, or the two linking members 14 can beregarded as part of the two side wing members 15 and are respectivelyconnected to the end portions 154 of the two side wing members 15. Thus,one of the two shafts 11 is spinable to synchronously rotate the othershaft 11 through the transmitting member 13 so as to respectively movethe two side wing members 15 along the two shafts 11.

As shown in FIGS. 8 and 13-15, the two buffering modules 2 arerespectively fastened to and arranged at two opposite outer sides of thetwo shafts 11. The two buffering modules 2 are respectively cooperatedwith the two side wing members 15. Each portion of each of the twobuffering module 2 fastened to the corresponding shaft 11 is arrangedbetween the positioning member 16 and the adjacent end portion 154 ofthe side wing member 15, and is an end of the moving path of the twoside wing members 15. Moreover, as the buffering modules 2 are of thesame or symmetrical structure, the following description only disclosesthe structure of one of the buffering modules 2 for the sake of brevity.

The buffering module 2 includes an internal connecting member 21, anexternal connecting member 22, and two limiting mechanisms 23. Theinternal connecting member 21 is fixed on and synchronously rotatablewith the corresponding shaft 11. The external connecting member 22 isfixed on the inner surface 201 of the carrying plate 200 and is slidablydisposed on the internal connecting member 21. The two limitingmechanisms 23 are installed on the internal connecting member 21 forpositioning the external connecting member 21.

The internal connecting member 21 in the present embodiment includes asheet 211 and two pivoting blocks 212 fixed on the sheet 211. The twopivoting blocks 212 are respectively sleeved on and fixed in the twowedging segments 113 of the corresponding shaft 11, and each of the twopivoting blocks 212 is arranged between the adjacent positioning member16 and the adjacent end portion 154 of the corresponding side wingmember 15. The sheet 211 has a long hole 2111 parallel to each of thetwo rotation axes L and sleeved on the limiting portion 153 of thecorresponding side wing member 15. A length of the long hole 2111 islarger than the moving path of the corresponding side wing member 15 inthe rotation axis L.

Moreover, the external connecting member 22 in the present embodimentincludes a bottom plate 221 and two track seats 222 disposed on thebottom plate 221. The bottom plate 221 and the track seats 222 are fixedon the inner surface 201 of the carrying plate 200. The bottom plate 221has a slanting hole 2211 non-parallel to the long hole 2111 and sleevedon the limiting portion 153 of the corresponding side wing member 15. Inother words, a projecting region, which is defined by orthogonallyprojecting the slanting hole 2211 and the long hole 2111 onto a plane,has an acute angle there-between. The slanting hole 2211 has a first end2212 arranged adjacent to the corresponding shaft 11 and an oppositesecond end 2213 arranged away from the corresponding shaft 11.Specifically, the limiting portion 153 of the corresponding side wingmember 15 is sequentially inserted into the long hole 2111 and theslanting hole 2211. The sheet 211 of the internal connecting member 21is slidably disposed on the two track seats 222 of the externalconnecting member 22, and each of the track seats 222 has two limitingslots 2221 spaced each other.

Each of the limiting mechanisms 23 in the present embodiment includes abase 231, a limiting member 232 disposed on the base 231, and aplurality of springs 233 connected to the base 231 and the limitingmember 232 (as shown in FIG. 15). The bases 231 of the two limitingmechanisms 23 are fixed on the sheet 211 of the internal connectingmember 21. The springs 233 of the two limiting mechanisms 23 areconfigured to respectively move the two limiting members 232 toward thetwo track seats 222, thereby maintaining the contact between each of thetwo limiting members 232 and the corresponding track seat 222. Moreover,each of the two limiting members 232 is selectively engaged in one ofthe two limiting slots 2221 of the corresponding track seat 222.

Specifically, when the carrying plate 200 is bent along at least one ofthe two axes L between the unfolded position (as shown in FIGS. 1 and 8)and the outwardly folded position (as shown in FIGS. 3 to 5), theexternal connecting member 22 of each of the buffering modules 2 slideswith respect to the corresponding internal connecting member 21, each ofthe limiting portions 153 moves in the corresponding slanting hole 2211from the first end 2212 to the second end 2213, and the limiting member232 of each limiting mechanism 23 is moved from one of the two limitingslots 2221 to the other limiting slot 2221 of each track seat 222 of thecorresponding external connecting member 22.

It should be noted that when the carrying plate 200 is bent, the widthof the carrying plate 200 perpendicular to each of the rotation axes Land the width of each dual-shaft hinge module 2 defined by a maximumlength between the two side wing members 15 are not changed, so that thetwo external connecting members 22 of each supporting device 100 mountedon the carrying plate 200 have a fixed length, and the two internalconnecting members 21 of each dual-shaft hinge module 2 have a fixedlength. Thus, when the carrying plate 200 is bent from the unfoldedposition toward the outwardly folded position, the two internalconnecting members 21 of each supporting device 100 are outwardly movedwith respect to the two corresponding external connecting members 22.

Accordingly, when the carrying plate 100 is bent to the outwardly foldedposition, the cooperation of each slanting hole 2211 and thecorresponding limiting portion 153 and the cooperation of each limitingmechanism 23 and the two limiting slots 2221 of the correspondingexternal connecting member 22 are provided to effectively prevent thecarrying plate 200 from being bent in a direction away from the unfoldedposition. In other words, the carrying plate 200 or the bendable display300 can be avoided to be bent inwardly.

In addition, the two bottom plates 221 of one of the two supportingdevices 100 in the present embodiment are respectively and integrallyformed with the two bottom plates 221 of the other supporting device100, but the present disclosure is not limited thereto. For example, inother embodiments of the present disclosure, the two bottom plates 221of one of the two supporting devices 100 can be respectively separatedfrom the two bottom plates 221 of the other supporting device 100.

The descriptions illustrated supra set forth simply the preferredembodiments of the present disclosure; however, the characteristics ofthe present disclosure are by no means restricted thereto. All changes,alterations, or modifications conveniently considered by those skilledin the art are deemed to be encompassed within the scope of the presentdisclosure delineated by the following claims.

What is claimed is:
 1. A bendable display apparatus, comprising: acarrying plate having an inner surface and an outer surface opposing tothe inner surface; a bendable display mounted on the outer surface ofthe carrying surface; two supporting devices disposed on the innersurface of the carrying plate and defining two rotation axes, each ofthe two supporting devices including: a dual-shaft hinge moduleincluding: two shafts respectively arranged in the two rotation axes andeach having a spiral groove recessed on an outer surface thereof; atransmitting member clamped between the two shafts, wherein thetransmitting member has two driving portions respectively protrudingfrom two opposite sides thereof and respectively inserted into the twospiral grooves of the two shafts; and two side wing members respectivelyand slidably fastened to the two shafts and each having a limitingportion; wherein one of the two shafts is spinable to synchronouslyrotate the other shaft through the transmitting member so as torespectively move the two side wing members along the two shafts; andtwo buffering modules respectively fastened to the two shafts andarranged at two opposite outer sides of the two shafts, wherein the twobuffering modules are respectively cooperated with the two side wingmembers, and each of the two buffering modules includes: an internalconnecting member fixed on and synchronously rotatable with thecorresponding shaft, wherein the internal connecting member has a longhole parallel to each of the two rotation axes and sleeved on thelimiting portion of the corresponding side wing member; and an externalconnecting member fixed on the inner surface of the carrying plate andslidably disposed on the internal connecting member, wherein theexternal connecting member has a slanting hole non-parallel to each ofthe two rotation axes and sleeved on the limiting portion of thecorresponding side wing member, and the slanting hole has a first endarranged adjacent to the corresponding shaft and an opposite second endarranged away from the corresponding shaft; wherein when the carryingplate is bent along at least one of the two axes between an unfoldedposition and an outwardly folded position, the external connectingmember of each of the buffering modules slides with respect to thecorresponding internal connecting member, and each of the limitingportions moves in the corresponding slanting hole from the first end tothe second end.
 2. The bendable display apparatus as claimed in claim 1,wherein each of the transmitting members includes a transmitting blockand a transmitting rod coupling through and fastened to the transmittingblock; in the dual-shaft hinge module of each of the two supportingdevices, the transmitting block is sandwiched between the two shafts andincludes the two driving portions respectively arranged on two oppositesides thereof.
 3. The bendable display apparatus as claimed in claim 2,wherein in the dual-shaft hinge module of each of the two supportingdevices, the transmitting block has two concave surfaces respectivelyrecessed on the two opposite sides thereof and respectively facing thetwo shafts, the two driving portions respectively protrude from the twoconcave surfaces, and each of the two concave surfaces is arranged toaccommodate a portion of the corresponding shaft.
 4. The bendabledisplay apparatus as claimed in claim 3, wherein in a cross section ofthe dual-shaft hinge module of each of the two supporting devicesperpendicular to each of the two axes, each of the two concave surfacesis substantially an arc shape having a center of circle overlapped at acenter of the portion of the corresponding shaft.
 5. The bendabledisplay apparatus as claimed in claim 1, wherein the dual-shaft hingemodule of each of the two supporting devices includes two linkingmembers respectively arranged at two opposite sides of the transmittingblock and each sleeved on the two shafts; wherein in the dual-shafthinge module of each of the two supporting devices, two opposite ends ofthe transmitting rod are respectively abutted against inner surfaces ofthe two linking members, each of the two side wing members includes twoend portions slidably sleeved on the corresponding shaft andrespectively abutted against outer surfaces of the two linking members,the transmitting member and the two linking members are synchronouslymovable to move the two side wing members along the two shafts at thesame time.
 6. The bendable display apparatus as claimed in claim 1,wherein each of the external connecting members includes a bottom plateand two track seats disposed on the bottom plate, and each of theinternal connecting members is slidably disposed on the two track seatsof the corresponding external connecting member, wherein the two bottomplates of one of the two supporting devices are respectively andintegrally formed with the two bottom plates of the other supportingdevice.
 7. The bendable display apparatus as claimed in claim 1, whereineach of the external connecting members has two limiting slots spacedeach other, and each of the buffering modules includes a limitingmechanism installed on the internal connecting member thereof andengaged in one of the two limiting slots of the external connectingmember thereof, wherein when the carrying plate is bent from theunfolded position to the outwardly folded position, the limitingmechanism in each of the buffering modules is moved from one of the twolimiting slots to the other limiting slot of the corresponding externalconnecting member.
 8. The bendable display apparatus as claimed in claim1, wherein each of the dual-shaft hinge modules includes a plurality ofstacked torsion washers; in each of the dual-shaft hinge modules, thetwo shafts pass through each of the torsion washers, and the two shaftsare spinable with respect to each of the torsion washers to provide atorsion by a friction generated between the two shafts and each of thetorsion washers.
 9. The bendable display apparatus as claimed in claim1, wherein each of the spiral grooves has a spiral angle within a rangeof degrees, and a depth of each of the spiral grooves is ⅕- 1/7 of amaximum diameter of the corresponding shaft.